Grinding-mill



(No Model.) J. W. VAUGHAN' 3 Sheets-,Sheet 1.

GRINDING MILL.

A No. 515,181. Patented Feb. 20', 1894.

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(No Model.) 3 Sheets-Sheet 2.

J. W. VAUGHAN.

GRINDING MILL.

Patented Feb.. 20, 1894.

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Patented Feb. 20, 1894.

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W/TNESSES.' www UNTTED STATES PATENT JOHN w. vAUeHAN, on TAYLoRsvILLE, INDIANA.

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SPECIFICATION forming part of Letters Patent No. 515,181, dated February 20,1894.

Application filed May 23,1893. Serial No. 475,254- (No model.)

T0 all whom it may concern.-

Be it known that I, JOHN W. VAUGHAN, a citizen of the United States, residing at Taylorsville, in the county of Bartholomew and State of Indiana, vhave invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

The object of my said invention is to pro` duce a grinding mill in which disks shall to a large extent take the place of rolls, or in other words, to secure many of the advantages of a roller mill in a mill of substantially thflgeneral form of the old fashioned burr mi A grinding mill embodyingr said invention will first be fully described, and the novel features thereof then pointed outin theclaims.

Referring to the accompanying drawings, which are made a part hereof, and on which similailetters of reference indicate similar parts, Figure 1 is a side elevation, with a portion of the frame-work cut away, of a mill embodying my said invention, as seen from the dotted line l l; Fig. 2 a central vertical sectional view on the dotted line 2 2; Fig. "3 a top or plan view, except the hopper, as seen from the dotted line 3 3; Figs. 4, 5 and 6 horizontal sectional views on the dotted lines 4 4, 5 5 and 6 6, respectively, and Figs. 7 and 8 detail views, on an enlarged scale, similar to portions of Figs. 2 and 5.

In said drawings the portions marked A represent the frame-work of the mill; B the driving shaft; C the'central disk shaft by 4,

which the upper disk is driven; D a sleeve thereon by which the lower disk is driven ;v E an adjustable yoke carrying the shaft C; F and G the grinding disks, and H the hopper.

The frame-work A'is preferably of a skeleton form, and is constructed as shown, with the cross bars or bridge trees A A2 and A3 for supporting the mechanism, and wings or brackets A4 for supporting the case which contains the grinding disks. The said case, A5, is mounted on said brackets A4, and its position concentrically to the grinding disks is adjusted and determined by means of set screws a5. As shown in the drawings, most plainly in Fig. 4, a discharging spout A6 leads ont from one side of said case, through which the treated material may escape. The upper portion of the frame A is preferably separable from the lower, in order to permit the case A5 and grinding disks to be conveniently inserted, and is secured to the lower portion by bolts a. The general construction of this frame is best shown in Fig..2.

The driving shaft B extends up from any convenient motor, (not shown,) and is adapted to drive the grinding disks. These should be 6o driven in the same direction, but at different speeds, and therefore the spur gears B and B2 on said shaft and the corresponding gears C and D on the shaft C and sleeve D are of different sizes, as shown in Figs. 1, 5 and 6. 65 The shaft C is mounted at the lower end in a bearing in the bridge tree A', and at the upper end in an adjustable bearing C2 secured in the upper end of the frame A. Set screws c2 form a desirable means of adjust- 7o ment. The downward thrust of this shaft is received through a step C3 and stud e, as will be presently described. Just above its eX- treme lower end a groove is formed therein, into which a collar o is inserted, and upon this collar, either with or without the interposition of a washer c, bearsaspringS which holds said shaft down onto its step, except when forcibly raised during the process of grinding, as when anything too hard to be 8o ground comes between the grinding disks, thus forcing the disk G upwardly, which, being fxedly secured to said shaft C,pulls said shaft with it, compressing said spring. A plate Ssurrounding the shaft forms the upper S5 bearing for the spring S, and the set screwss engagingwith the cross-bar A2 serve to adjust said plate and regulate the tension of the spring.

The sleeve D is firmly secured to the disk 9o F, and drives the same, it being driven by the gear wheel D', which is firmly secured thereto. 'lhis sleeve surrounds the shaft C, which is recessed' or cut down at this point to receive it, and also an interior boxing D2, which, as shown in Fig. 8, is made in sections, and inclosed within the sleeve, between it and the shaft. These sections may be adjusted by means of set screws cl2, which bear against and rest in notches in the sides of the shaft G. rco By this means the bearing may be a closed one at all times, and wear may be compensated for. It is also a means whereby the relative position of the sleeve D and shaft C may be determined within the limits of a small but suflicient adjustment. The sleeve vD terminates at the lupper end in a flange plate D3, which is bolted fast to the under.

side of the lower grinding disk F, and is thus rendered practically integral therewith. A flange plate D4 is secured to the bridge tree A3, and contains an annular groove in its upper surface into which the lower end of the sleeve D will enter, and thus said sleeve 1s 'given a firm support. The lower end of the sleeve may be thickened somewhat where it enters this groove, giving greater bearlng surface, as shown most plainly in Fig. 7.

The yoke E is carried by rods Eupon the upper ends of which are hand wheels c', and th us said yoke may be adjusted up and down, and thevertical position of the shaft C determined. rlwo of these rods and hand wheels are shown, and an adjustment is thus provided for at both ends of the yoke; but manifestly an adjustment at one end only would be sufficient. By means of this adjustable yoke the distance between the grinding disks 1s determined, and the coarseness or fineness of the,product of the mill thus also determined.

The grinding disks F and G are in form much like the stone burrs of old-fashioned grinding mills. They both revolve, however, instead of one only, as in such old fashioned mills, and thus greater uniformity of relation can be secured, as each is subjected to substantially equal wear, while there is a greater centrifugal force upon the material to be ground, which is of considerable advantage.

The hopper'H has a longspout orfeed tube H which extends down into a central perforation in theupper end of the central shaft C to a'point substantially opposite the grinding space between the two grinding disks. At the bottom of the perforation in the shaft C are radial orices in said shaft leading out into said space through which the material to be ground may escape. The feeding tube H passes down within this perforation to partially across these radial orifices, and by adjusting the same vertically, the openings through which the material may escape to between the grinding disks is varied. I have shown this feeding tube as screw thread` ed upon the outside with an annular interiorly screw threaded ring h surrounding it and resting upon the bearing C2. Manifestly, by revolving said ring, the hopper and its feed tube may be elevated or depressed as may be desired, and a screw thread adjustment like this is capable of very fine manipulation, so that the feed may be very accurately determined.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is l 1. The combination, in agrinding mill, of

the two grinding disks,a central shaft carrying the upper grinding disk and passing through the lower grinding disk, a sleeve surrounding said shaft and attached to said lower `grinding disk, a space between said sleeve and said shaft, and an adjustable boxing placed within said space, whereby the relation of the sleeve and shaft to each other can be regulated, and wear compensated for, substantially as set forth.

2. The combination, in a grinding mill, of the grinding disks, a central shaft carrying the upper grinding disk, a sleeve surrounding said shaftand carrying the lower grinding disk, a space between said sleeve and said shaft, and a boxing composed of sections D2 interposed in said space and provided with set screws d2 whereby they may be adjusted, substantially as shown and described.

3. The combination, in a grinding mi1l,of the two grinding disks, a central. shaft mounted upon a step and passing through the lower grinding diskand secured to and support- TIO ing the upper grinding disk, the plateD4 secured to the frame-work, a sleeve' surrounding said central shaft and secured to and supporting the lower grinding disk and resting upon and carried by said plate, said lplate being provided with an annular ring which surrounds and retains in position said sleeve substantially as shown and described.

4. The combination in a grinding mill, of the grinding disks,the driving mechanism, the frame-work, a casing surrounding the grinding disks and supported by the frame-Work and adjustable thereon by means of set screws a5, substantially as shown and described.

5. The combination of two grinding disks, the central shaft passing through the lower and supporting the upper disk,an adjustable step carrying said shaft., a sleeve surrounding said shaft and secured to the lower'disk, gearing connecting said sleeve and said shaft whereby one is driven from the other, a ycollar c secured to said shaftan adjustable plate S surrounding said shaft and bearing against a portion of the frame, a spring S interposed between said collar and said plate, said shaft being also provided with a longitudinal perforation at its upper end with radial orifices leading out between the grinding disks, a hopper having a tubeleading down into said perforation, and an appropriate casing surrounding said grinding disks, the whole forming a grindingk mill, andarranged and operating l substantially as set forth.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 20th day of May, A. D., 1893.

JOHN W. VAUGHAN. [L. s]

Witnesses:

CHESTER BRADFORD, JAMES A. WALSH,

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